Hand-held communication equipment with a radiation shielding antenna apparatus

ABSTRACT

A hand-held communication equipment with a radiation shielding antenna apparatus is provided. It comprises a hand-held main body and an antenna apparatus, characterized in that said antenna apparatus comprises an antenna rod and an antenna pedestal, wherein an inductive coil, an inductive coil fixing frame and a radiation shielding case are fixed in said pedestal; the lower end of the antenna rod has a globe joint; there is a plate spring at the upper end of the inductive coil pressing tightly against said antenna rod serving as the signal source of the antenna; there is a plug on the bottom of the fixing frame designed to fit in with an antenna socket in the hand-held main body for plugging the antenna apparatus into the main body; said radiation shielding case encases the inductive coil for producing the capacitance between said shielding case and said inductive coil, thereby changing the polarizing mode of the antenna; in the working state, the antenna rod tilts toward the backside of the hand-held communication equipment main body, so as to change the polarizing mode of the antenna into a dual foliar polarizing mode, thus enabling the head part of the user to be in the radiation safe area generated by the new polarizing mode.

TECHNICAL FIELD

This invention relates to a hand-held communication equipment with aradiation shielding antenna apparatus, and in particular, relates toaltering the direction of a vertical antenna of the hand-heldcommunication equipment, such as hand-held telephone, interphone andcordless telephone, etc., by tilting it toward a direction away fromhuman body and to the horizontal direction (i.e., letting the antennatilt backward to the backside of the hand-held telephone's main body),so that the user's head is in a safe area formed in the new polarizingmode, thereby damping the electromagnetic radiation to the user's headpart below the safety standard.

BACKGROUND ART

At present, hand-held communication equipment has become more and morepopular for its advantages such as free from the restriction oftelephone line, handy portability and rapid connection. However, theradiation pollution brought by the hand-held communication equipment tothe user shall not be ignored. Take a hand-held telephone set forexample, when the user is having a call, the sound wave is convertedinto high-frequency electromagnetic wave by the hand-held telephone soas to send out electric signal. At the same time, relatively intensivehigh-frequency microwave radiation will occur in the surrounding spaceof the handset antenna. If the user's head part is exposed to suchintense high frequency microwave radiation for long durationsfrequently, an injury to the user's head may be caused and result inpathological changes.

FIG. 1 is a diagram of electromagnetic radiation pattern of aconventional hand-held telephone antenna, which is used as an example toillustrate the radiation pollution of a hand-held telephoneovershadowing the user's head.

The existing hand-held telephone antenna are usually divided into thefollowing types: the ordinary rod type antenna, which is generally usedin the communication equipment with microwave band with relativelyshorter wavelength; inductively-loaded rod type antenna, which can beused in the communication equipment with relatively wider frequency bandin which the length of the antenna is limited by the inductance for thepurpose of shortening the antenna length so that it can be carriedconveniently; pure inductance type antenna, used in mini and microcommunication equipment, in which the antenna is minimized mainly foreasy carrying; magnetic induction type antenna, used in single-sectiontelescopic type hand-set, featuring a structure which is easy to carryand handy to use.

The electromagnetic waves transmitted by the above four types ofantennae emit all around, as shown in FIG. 1, therefore the microwaveradiation to the user will occur. Under the condition of the same power,the shorter the antenna is, the greater the transmitted power densitywill be, and consequently the severer the radiation to the user's headpart will be. As it is specified explicitly in the safety and hygienicstandards of environmental electromagnetic wave radiation published bythe Health Ministry of the People's Republic of China that 40 mW/cm² isthe second-grade safety standard, the value exceeding this standard willhave harmful influence on human body. Take the hand-held telephone forexample, according to the test conducted by the China NationalMetrological Institute, when the transmitted power is 0.6 w, theelectromagnetic power density around the antenna is 1100 to 2800 mW/cm².

DISCLOSURE OF THE PRESENT INVENTION

The purpose of the present invention is to provide a hand-heldcommunication equipment with a radiation shielding antenna apparatus toovercome the above defects in the prior art. When using thecommunication equipment with a radiation shielding antenna apparatus ofthe present invention, the head part of the user is in a safe areaformed by the new polarizing mode so that the electromagnetic radiationsustained by the user's head will be minimized to attain the safetystandards established by the Health Ministry of the People's Republic ofChina.

The purpose of the present invention is achieved as follows: thehand-held communication equipment with a radiation shielding antennaapparatus of the present invention comprises a hand-held main body ofthe communication equipment and an antenna apparatus, in which saidantenna apparatus comprises an antenna rod and a radiation shieldingcase disposed at the base portion of the antenna. When the user makesuse of said hand-held communication equipment, said antenna rod shall betilted toward the backside of the main body of the hand-heldcommunication equipment, with the angle between the antenna rod and themain body being 0°<θ<90°, preferably 45°<θ90°, and most preferablyθ=90°, thus, by means of changing the position of the antenna relativeto the main body, and by the capacitance produced between the radiationshielding case and the inductive coil within the antenna apparatus, thepolarizing mode of the antenna is changed into a dual-foliar polarizingmode, thus, a safe area is formed in the position around the user's headpart, thereby minimizing the radiation to the user's head part

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram of the antenna polarizing mode when a conventionalhand-held telephone is in use;

FIG. 2 shows the structure of the antenna apparatus of the presentinvention;

FIG. 3 shows the hand-held telephone of the present invention in aworking state,

FIG. 4 is a diagram illustrating the principle of polarizing mode of theantenna apparatus of the present invention.

EMBODIMENT OF THE PRESENT INVENTION

In order to describe clearly the structure and principle of the antennaapparatus of the invention, Motorola 9900 hand-held telephone is takenfor example, however, it is apparent to those skilled in the art thatthe structure and principle of the present invention can also be appliedto other types of hand-held communication equipment.

FIG. 2A and 2B are detailed illustrations of the structure of theantenna apparatus of the present invention, and FIG. 3 is a hand-heldtelephone equipped with the antenna apparatus of the present invention,FIG. 2A shows the antenna in a vertical position, and FIG. 2Billustrates that the antenna is perpendicular to the main body when thehand-held equipment is in a working state. The antenna apparatus of thepresent invention comprises an antenna rod 2 and an antenna pedestal 3.An inductive coil 5, an inductive-coil fixing frame 6, a radiationshielding case 7 and a pedestal shell 8 are fixed on the pedestal 3. Thelower end of the antenna rod may have a globe joint 9 or the like sothat the antenna rod 2 can tilt toward the backside of the main bodyafter being pulled out completely from the sleeve 4 in the telephonemain body 1, until it is perpendicular to the main body. There is aplate spring 10 at the upper end of the inductive coil 5 pressingtightly against the antenna rod 2 to serve as a signal source of theantenna. The coil 5 is molded inside of the inductive coil fixing frame6. There is a plug 11 on the bottom of the fixing frame 6, designed tofit in with the antenna socket of the hand-held telephone 1 for pluggingthe antenna apparatus into the main body. The radiation shielding case 7made of a metallic material is grounded and covers the inductive coilfixing frame 6 for producing shielding effect to prevent theelectromagnetism in the inductance from leaking, and achieving a changein the electromagnetic polarizing mode through the capacitance producedbetween the radiation shielding case 7 and the inductive coil 5, so asto damp the electromagnetic field around the hand-held telephoneearphone, thereby enabling the effective power to act on the antenna rod2. The coil 5, fixing frame 6 and radiation shielding case 7, etc. areencased completely in the pedestal shell 8. Said pedestal shell 8 has anotch open toward the backside of the main body, with the width of saidnotch being equal to the diameter of the antenna for fixing theorientation of the antenna so that the antenna can not swing in thehorizontal direction when it is perpendicular to the main body.

When the user wants to use the hand-held communication equipment of thepresent invention, he only needs to insert the plug 11 on the bottom ofthe inductive-coil fixing frame 6 into the antenna socket of the handsetwith the notch of the antenna pedestal shell open toward the backside ofthe main body, and press the snap-on portion 12 of the antenna pedestalshell onto the corresponding portion of the handset shell. When theantenna is inserted completely into the antenna sleeve 4 in the handset,the handset is in a receiving state. If the user needs to make a call,the antenna rod 2 shall be pulled out completely from the sleeve 4, asshown in FIG. 3, and tilted toward the backside of the main body,preferably until it is perpendicular to the main body.

The polarizing mode of the antenna apparatus of the present inventionand the principle of damping the radiation to the head part of the userwill be illustrated as follows with reference to FIGS. 2, 3 and 4.

The basic principle of the present invention is to change the polarizingmode of the antenna for a new polarizing mode, i.e., to shift thedirection of a vertical antenna by letting it tilt toward the backsideof the main body or be perpendicular to the main body and in combinationwith the arrangement of a radiation shielding case mounted at the baseportion of the antenna to get the radiation intensity of thecommunication equipment antenna to be different in different directions,and to form a weak field strength area in a certain region, which iscalled a safe area. In this safe area the purpose of radiation shieldingcan be attained by diverting the strong field away from the position ofthe user's head part; that is , by means of changing the relevantposition of the antenna and incorporating the principle ofelectromagnetic shielding, the user's head part can be protected fromstrong electromagnetic wave radiation in a relevant position. As shownin FIG. 4, the matched inductance of the antenna pedestal is shieldedwith a grounded metal shell to prevent the electromagnetic wave fromleaking and endangering the safety of the user's head part, thus, inaddition to changing the electromagnetic direction of the antenna(asshown in the figures), a reasonable impedance matching can be achievedby the capacitance generated between the radiation shielding case andthe inductance to produce a safe area in the earphone position near thehead part and attain the purpose of radiation shielding.

Although a preferred embodiment of the present inventions is disclosedin connection with an example, it should be understood by those skilledin the art that it is possible for various modifications, substitutionsand supplements within the scope of claims and the principle of thepresent invention.

We claim:
 1. A hand-held communication equipment with a radiationshielding antenna apparatus, comprising a hand-held main body and anantenna apparatus, characterized in that said antenna apparatuscomprises an antenna rod and an antenna pedestal, wherein an inductivecoil, an inductive coil fixing frame and a radiation shielding case arefixed in said pedestal; the lower end of the antenna rod has a globejoint; there is a plate spring (101 at the upper end of the inductivecoil pressing tightly against said antenna rod serving as the signalsource of the antenna; there is a plug on the bottom of the fixing framedesigned to fit in with an antenna socket in the hand-held main body forplugging the antenna apparatus into the main body; said radiationshielding case encases the inductive coil for producing the capacitancebetween said shielding case and said inductive coil, thereby changingthe polarizing mode of the antenna; in the working state, the antennarod tilts toward the backside of the handheld communication equipmentmain body, so as to change the polarizing mode of the antenna into adual foliar polarizing mode, thus enabling the head part of the user tobe in the radiation safe area generated by the new polarizing mode. 2.The hand-held communication equipment with a radiation shielding antennaapparatus according to claim 1, characterized in that the angle betweenthe antenna rod and the main body is 0°<θ<90°.
 3. The hand-heldcommunication equipment with a radiation shielding antenna apparatusaccording to claim, characterized in that the angle between the antennarod and the main body is θ=90°.